Ah I completely forgot how recent the calamity was. So my new plan is that it was a beastman attack, and so he was found wandering the woods at maybe 2 or 3 at the oldest. The family who found him were a couple of Hyur who used to be adventurers but were going to settle down and have a family in Limsa Lominsa.
He’s studying as an arcanist to be a scholar, but will ultimately find that he grows tired of the structure and arithmetic and aim to be a conjurer, becoming a sort of wandering mystic type who is dedicated to Oschon.